Computer wont display anything at all

[stherebul]

My computer runs on XP starts up and im using a brand new power supply but the monitor will not diplay anything. I've tried several monitors and it still give me the same result.What can i do and what is the cause?

[TristanPerry]

Do you have a dedicated graphics card? Could be a fault with that.

I assume that when you power on your computer, the fans and hard-drive start-up okay? (Since you say you have a new PSU so I doubt it's that)

[JJ 3000]

When your computer is starting up (before windows loads) do you see anything on the screen at all?

Do you hear any beeps when your computer starts up?

Did you have this problem before you installed the new power supply?